Ask any questions about using PicoScope Automotive software here.
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Martinjensen
- TwoWaves
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by Martinjensen » Tue Dec 17, 2013 12:44 pm
Having a Corolla Verso 2,2D4D 2AD-FTV in for a complaint for extented crank time.
I am measuring the signal for the railpressure sensor, for viewing rail pressure build up.
Is there a method to convert the voltage signal from the railpressure sensor into pressure, using custom probes or maby math channels?
So i dont have to calculate it myself, but let the great Pico software do the math for me 
The scaling for the sensor is: 1Volt = 0 Bar and for every 160mv you have 100bar
It could be great to make a custom set up for both Bosch, Delphi and Denso railpressure sensors
Regards Martin Jensen
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Robski
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by Robski » Tue Dec 17, 2013 4:33 pm
yes there is a method, whats the max reading (pressure) & at what voltage ? (you already have the base line)
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Martinjensen
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by Martinjensen » Tue Dec 17, 2013 8:55 pm
The sensor is a 5Volt sensor, and if we say that the maximum voltage output is 4,5Volt the pressure is 2187,50bar
Martin
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KimAndersen
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by KimAndersen » Tue Dec 17, 2013 9:40 pm
Hi
Just be aware of if you choose to make different custom probes for different rail pressure transducer, that you have the right specification for that particular sensor. I would say that you need OEM specification from the factory that are manufacturing those pressure transducer.
I reckon that your Toyota Verso are equipped with a denso rail pressure transducer ?
Regards
Kim
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Robski
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by Robski » Tue Dec 17, 2013 10:11 pm
Martinjensen wrote:The sensor is a 5Volt sensor, and if we say that the maximum voltage output is 4,5Volt the pressure is 2187,50bar
Martin
is that factory information & exact ?
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Martinjensen
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by Martinjensen » Wed Dec 18, 2013 8:33 am
It's a Denso system capable of delivering 1800 Bar.
I am fully aware of the pitfalls of chosing the wrong scaling for the sensor.
But i think it would be neet to let the program do the math for me.
Regards Martin
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Robski
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by Robski » Wed Dec 18, 2013 8:42 am
PM me your email address & I'll create you a probe, can you compare it against live data from your scan tool & give me feedback ?
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Robski
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by Robski » Wed Dec 18, 2013 1:55 pm
email sent 
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smokey08
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by smokey08 » Sun Dec 22, 2013 8:04 pm
I find this a very intresting topic. As in also into tuning i have had a look at how the ecus calculate rail pressure. I dont have any toyota denso information but i have extracted some information out of a peugeot dv6ted4 file (bosch edc16c34). I also checked a volvo file which uses same engine and values are identical.
Values are:
0 bar = 498.53mv
1800 bar = 4550.34mv
These are the only 2 values the ecu uses so it must be a straight linearisation between these 2 values.
